Supported Peci Command Functions And Codes; Gettemp0() Error Codes - Intel 5148LV - Xeon Dual Core Active H Datasheet

Thermal Specifications
Table 6-11. Supported PECI Command Functions and Codes
Command
Function
Ping()
GetTemp0()
6.3.2.3 PECI Fault Handling Requirements
PECI is largely a fault tolerant interface, including noise immunity and error checking
improvements over other comparable industry standard interfaces. The PECI client is
as reliable as the device that it is embedded in, and thus given operating conditions
that fall under the specification, the PECI will always respond to requests and the
protocol itself can be relied upon to detect any transmission failures. There are,
however, certain scenarios where the PECI is know to be unresponsive.
Prior to a power on RESET# and during RESET# assertion, PECI is not guaranteed to
provide reliable thermal data. System designs should implement a default power-on
condition that ensures proper processor operation during the time frame when reliable
data is not available via PECI.
To protect platforms from potential operational or safety issues due to an abnormal
condition on PECI, the Host controller should take action to protect the system from
possible damaging states. If the Host controller cannot complete a valid PECI
transactions of GetTemp0() with a given PECI device over 3 consecutive failed
transactions or a one second max specified interval, then it should take appropriate
actions to protect the corresponding device and/or other system components from
overheating. The host controller may also implement an alert to software in the event
of a critical or continuous fault condition.
6.3.2.4 PECI GetTemp0() Error Code Support
The error codes supported for the processor GetTemp0() command are listed in
Table 6-12
Table 6-12. GetTemp0() Error Codes
Error Code
0x8000
0x8002
® ®
Dual-Core Intel Xeon Processor 5100 Series Datasheet
Code
This command targets a valid PECI device address followed by zero Write Length
n/a
and zero Read Length.
Write Length: 1
0x01 Read Length: 2
Returns the temperature of the processor in Domain 0
below:
General sensor error
Sensor is operational, but has detected a temperature below its operational range
(underflow), currently 30
Comments
Description
o
C absolute temperature.
§
89